The second of the advanced Apollo-J missions targeted the Descartes region of the Moon and once again produced impressive scientific results.

The crew for the fifth lunar landing was led by experienced Apollo and Gemini astronaut John Young, with two unflown astronauts, Thomas K. (Ken) Mattingly and Charles Duke, as Command Module Pilot and Lunar Module Pilot respectively. Young, Duke, and Jack Swigert had originally been the backup crew for Apollo 13, with Mattingly scheduled as CMP for that mission. After Mattingly was exposed to German measles, Swigert and Mattingly had switched places in the crew roster.

After an uneventful trip to the Moon, the mission was almost aborted during the CM's final descent, on 20 April. A fault developed in one of the thrusters on the CM, Casper, hampering its manoeuvres in lunar orbit. Eventually Houston decided to press ahead with the landing the following ^^^^^^^ day - but they cut short the stay in orbit after the surface mission, ^Hbr^l.

and Apollo 16 returned to a day

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